Best Synthflow Alternatives in 2026 (No Overages, True White Label & All-in-One Pricing)
Synthflow's Agency plan costs $1,400/month for 6,000 minutes. Exceed that? You're paying $0.12 per minute in overages.
Here's what that looks like for a real agency:
- 20 clients × 400 minutes each = 8,000 minutes
- 2,000 minutes over limit × $0.12 = $240 in overages
- Actual monthly cost: $1,640, not $1,400
One busy month erases your margin on multiple clients. And that's before we talk about the branding leaks, the support ticket redirects, and the clients who Google "Synthflow pricing" after seeing the name somewhere they shouldn't.
If you're building an agency on voice AI, the platform you choose determines whether you're running a profit center or subsidizing someone else's growth.
This guide breaks down the alternatives that solve Synthflow's specific problems—with real pricing, actual margin calculations, and honest tradeoffs.
Quick Answer: Which Alternative Fits Your Agency?
| Your Problem with Synthflow | Best Alternative | Why |
|---|---|---|
| Overages killing margins | Convocore | All-in-one pricing, no per-minute surprises |
| Need chat + voice + WhatsApp | Convocore | Only platform with voice AND multi-channel |
| Want BYOC control + lower costs | Retell AI | $0.07/min pay-as-you-go, no platform fees |
| Need complete brand invisibility | VoiceAIWrapper | Multi-provider wrapper with zero exposure |
| Clients need chat more than voice | Stammer AI | Chat-first with voice added, aggressive pricing |
Short on time? If overages and unpredictable costs are your main issue, jump to Convocore — it's the only platform where "all-in-one" actually means all-in-one.
The Real Problems with Synthflow's Agency Model
Synthflow isn't bad. The no-code builder works. Voice quality is solid. Workflow automation handles complex scenarios.
But specific issues compound into real business problems at scale:
Problem 1: The Overage Trap
Synthflow bundles minutes into plans. Sounds simple until clients have busy months.
| Plan | Monthly Cost | Included Minutes | Overage Rate | Minutes Per Client (20 clients) |
|---|---|---|---|---|
| Pro | $375 | 2,000 | $0.13/min | 100 min |
| Growth | $750 | 4,000 | $0.12/min | 200 min |
| Agency | $1,400 | 6,000 | $0.12/min | 300 min |
300 minutes per client per month. That's 75-100 calls at 3-4 minutes each.
For any client with real call volume—HVAC companies in summer, tax accountants in April, any business running campaigns—you'll blow past limits.
Real scenario: An agency with 15 HVAC clients hit 12,000 minutes in July (peak AC season). That's 6,000 minutes over their Agency plan = $720 in overages. Their $1,400/month plan actually cost $2,120 that month.
Problem 2: Branding Leaks
White label should mean invisible. Synthflow's implementation has gaps:
- Support tickets: Some agencies report client tickets routing to Synthflow's support, not theirs
- Email notifications: Platform name appearing in automated emails
- Call whispers: Underlying platform references in some configurations
For agencies charging $599-999/month for "your proprietary AI solution," these leaks create uncomfortable conversations.
Problem 3: The Graduation Risk
Synthflow markets directly to end users. When your client sees "Synthflow" anywhere and Googles it, they find:
- Synthflow's pricing page
- Direct signup options
- The realization they're paying you a markup
This is a business model risk, not a feature gap. Platforms built exclusively for agencies don't compete with their resellers.
Problem 4: Voice-Only Limitations
Synthflow does voice. That's it.
No WhatsApp. No Instagram DMs. No web chat. No SMS conversations.
In 2026, clients expect multi-channel. "We can do your phone calls, but you'll need another vendor for WhatsApp" is a losing pitch against agencies offering everything.
Cost Comparison: 10,000 Minutes/Month
Let's compare real costs for an agency handling 10,000 voice minutes monthly across clients:
Synthflow
| Component | Cost |
|---|---|
| Agency Plan | $1,400 |
| Overage (4,000 min × $0.12) | $480 |
| Monthly Total | $1,880 |
Plus: Potential branding exposure, voice-only limitation
Convocore
| Component | Cost |
|---|---|
| White Label Plan | $220 |
| Credits (~10,000 min) | ~$700 |
| Monthly Total | ~$920 |
Plus: Voice + WhatsApp + Instagram + chat included
Annual Difference: $11,520
Convocore costs roughly half—AND includes multi-channel capabilities Synthflow doesn't offer.
Retell AI (BYOC Model)
| Component | Cost |
|---|---|
| Platform fees | $0 |
| Voice minutes (10,000 × $0.07) | $700 |
| Twilio telephony (~$0.015/min) | $150 |
| Monthly Total | ~$850 |
Plus: Maximum control, but you manage Twilio separately
The 5 Best Synthflow Alternatives
1. Convocore — All-in-One Pricing, No Overage Surprises
Best for: Agencies tired of unpredictable monthly bills
Why agencies switch from Synthflow:
Convocore's pricing model eliminates the overage anxiety that plagues Synthflow agencies. You buy credits, you use credits. No "included minutes" that run out mid-month. No $0.12/minute penalties for success.
But the bigger advantage is channel coverage. Convocore handles:
- ✅ Voice calls (inbound + outbound)
- ✅ WhatsApp Business
- ✅ Instagram DMs
- ✅ Facebook Messenger
- ✅ Telegram
- ✅ Web chat
Synthflow does exactly one of these six channels.
The White Label Reality:
| Feature | Convocore | Synthflow |
|---|---|---|
| Custom domain | ✅ | ✅ |
| Full branding | ✅ | ✅ |
| Zero platform exposure | ✅ | ⚠️ Leaks reported |
| Client portals | ✅ | ✅ |
| Built-in rebilling | ✅ | ✅ |
| Multi-channel | ✅ | ❌ Voice only |
Key Differentiators:
- Smart Handoff: AI recognizes when humans should take over and transfers with full context—the caller doesn't repeat themselves
- Sentiment Detection: Real-time analysis adjusts tone or escalates frustrated callers automatically
- 40+ Native Integrations: HubSpot, Salesforce, ServiceTitan, Calendly connect directly—no Zapier costs
- All-in-One Telephony: Phone numbers included, no separate Twilio bill
Pricing:
| Plan | Price | What's Included |
|---|---|---|
| Free | $0/forever | 5 agents, 50 credits, all channels |
| Pay As You Go | $20/month | 100 agents, all features |
| White Label | $220/month | Full branding, 5 clients, custom domain |
| Enterprise | Custom | Volume discounts, unlimited |
Real Agency Math:
Agency with 15 clients on Convocore White Label:
- Revenue: 15 × $600/month = $9,000
- Platform: $220 + ~$500 usage = $720
- Profit: $8,280/month (92% gross margin)
Same agency on Synthflow Agency plan with similar usage:
- Revenue: $9,000
- Platform: $1,400 + ~$300 overages = $1,700
- Profit: $7,300/month (81% gross margin)
Annual difference: $11,760 more profit with Convocore.
Choose Convocore if: Overages stress you out. Clients need more than voice. You want one platform, one bill, predictable margins.
2. Retell AI — Maximum Control for Technical Agencies
Best for: Agencies with developers who want granular control
Why agencies switch from Synthflow:
Retell AI is the opposite of Synthflow's bundled approach. No platform fees. No included minutes. Just pay-as-you-go at $0.07+/minute.
For agencies with technical capacity, this creates better unit economics—especially for high-volume clients where Synthflow's overages compound.
The BYOC Reality:
Retell uses BYOC (Bring Your Own Carrier). You manage your own Twilio or Vonage account.
Pros:
- Total control over telephony costs
- No platform markup on minutes
- Choose your own carriers and numbers
Cons:
- Setup takes days, not hours
- You troubleshoot Twilio issues yourself
- Two vendors to manage instead of one
Where Retell Excels:
- IVR Navigation: AI agents can dial into other phone systems and press menu options—critical for insurance and healthcare
- Warm Transfers: Handoff with full context summary, not cold dumps
- Sub-600ms Latency: Consistently fast response times
- Partial White Label: API-level control, but you build client dashboards yourself
Pricing:
| Component | Cost |
|---|---|
| Platform | $0 |
| AI Voice | $0.07+/min |
| Your Twilio | ~$0.015/min |
| Total | ~$0.085/min all-in |
Real Agency Math:
Legal intake agency using Retell for 8 law firm clients:
- Usage: 6,000 minutes/month total
- Cost: 6,000 × $0.085 = $510
- Revenue: 8 × $400 = $3,200
- Profit: $2,690/month (84% margin)
Choose Retell AI if: Your team can handle Twilio. You want maximum control over costs. Complex IVR workflows matter.
3. VoiceAIWrapper — When Brand Invisibility is Non-Negotiable
Best for: Agencies who've been burned by platform exposure
Why agencies switch from Synthflow:
VoiceAIWrapper takes a different approach: it's a white label layer that sits on TOP of voice AI providers—Vapi, ElevenLabs, Retell, Deepgram.
The benefit? True brand invisibility. Your clients never see anything but your brand, ever.
Multi-Provider Flexibility:
| Client Need | Use This Provider |
|---|---|
| Best voice quality | ElevenLabs |
| Complex IVR | Retell |
| Existing Vapi investment | Vapi |
| Budget-conscious | Deepgram |
One agency dashboard. Multiple backends. Client never knows.
The White Label Implementation:
- Custom domains (yourplatform.com)
- Complete logo/branding control
- Client portals with your branding only
- Automated onboarding ("SaaS Creator" feature)
- Stripe rebilling with zero margin sharing
Pricing:
| Plan | Platform Cost | Provider Costs |
|---|---|---|
| Starter | $29/month | Direct to provider |
| Growth | $79/month | Direct to provider |
| Scale | $249/month | Direct to provider |
| Pro | $499/month | Direct to provider |
You pay VoiceAIWrapper's flat fee + whatever the underlying provider charges. No percentage taken from your client revenue.
The Tradeoff:
You're managing relationships with multiple vendors. When ElevenLabs has an outage, you explain it to clients—even though they've never heard of ElevenLabs.
Choose VoiceAIWrapper if: Complete brand invisibility matters most. You want provider flexibility. You're comfortable with multi-vendor complexity.
4. Stammer AI — When Chat Matters More Than Voice
Best for: Agencies whose clients need chatbots first, voice second
Why agencies consider it:
Stammer AI positions itself as the all-in-one AI agency platform—chat, voice, and email in one system. The economics are aggressive.
Their marketing claims: "Charge $499/mo | Your Cost: ~$12/mo | Your Profit: $487/mo per client"
That math assumes lower usage, but the margin potential is real for chat-focused deployments.
The Chat-First Reality:
Stammer started as a chatbot platform. Voice was added later. This is the opposite of Synthflow's architecture.
What this means:
- Chat capabilities are mature and full-featured
- Voice is functional but less sophisticated than dedicated platforms
- Best for clients where chat is primary, voice is supplementary
Where Stammer Excels:
- Complete white label across chat + voice
- Built-in Stripe rebilling
- Daily office hours support (Monday-Friday)
- Pre-built templates for common verticals
- 1,300+ agencies using the platform
Pricing:
| Plan | Price | Agents |
|---|---|---|
| Starter | $49/month | 1 |
| Agency | $197/month | 20 |
| Full SaaS | $497/month | 100 |
Choose Stammer AI if: Chatbots are your primary offering. Voice is a nice-to-have, not the main event. Aggressive unit economics matter.
5. OpenMic AI — When Simplicity and Compliance Intersect
Best for: Non-technical agencies in regulated industries
Why agencies consider it:
OpenMic AI built for resellers who want enterprise results without enterprise complexity. The platform emphasizes security (SOC 2) and simple setup.
Key Differentiators:
- Usage-based pricing starting at $0.01/minute — straightforward margin calculation
- Non-technical setup — no developers required
- Security-first architecture — SOC 2, enterprise encryption
- Strong white label — complete branding control
Pricing:
Transparent usage-based. Agencies report $100-300/month margins per client, scaling with usage.
The Tradeoff:
Less flexibility than developer-focused platforms. Complex workflows may require workarounds.
Choose OpenMic AI if: You serve regulated industries. Non-technical setup is essential. Transparent pricing matters more than maximum control.
Channel Comparison: The Deciding Factor
For many agencies, this table decides the choice:
| Channel | Convocore | Synthflow | Retell AI | Stammer AI | VoiceAIWrapper |
|---|---|---|---|---|---|
| Voice Calls | ✅ | ✅ | ✅ | ✅ | ✅ |
| ✅ | ❌ | ❌ | ✅ | ❌ | |
| Instagram DMs | ✅ | ❌ | ❌ | ❌ | ❌ |
| Messenger | ✅ | ❌ | ❌ | ✅ | ❌ |
| Web Chat | ✅ | ❌ | ❌ | ✅ | ❌ |
| SMS | ✅ | ❌ | ❌ | ✅ | ❌ |
The Pattern: Synthflow is voice-only. If clients ask "can you handle our Instagram inquiries too?", you need a second platform—or you lose the deal to someone using Convocore.
Decision Framework
Stay with Synthflow if:
- ✅ Voice-only is genuinely all you need
- ✅ Client volumes stay predictable (no seasonal spikes)
- ✅ Current margins work despite overages
- ✅ Branding leaks haven't caused client issues
- ✅ Migration effort isn't worth the savings
Switch to Convocore if:
- ✅ Overages are unpredictable or painful
- ✅ Clients need WhatsApp, Instagram, or chat
- ✅ All-in-one pricing appeals over bundled minutes
- ✅ Smart handoff and sentiment detection add value
- ✅ You want one vendor, one bill
Switch to Retell AI if:
- ✅ Your team can manage BYOC telephony
- ✅ Pay-as-you-go beats bundled pricing for your mix
- ✅ Complex IVR navigation is required
- ✅ Maximum control matters more than simplicity
Switch to VoiceAIWrapper if:
- ✅ Brand invisibility is non-negotiable
- ✅ You want to use different providers for different clients
- ✅ Multi-vendor complexity is acceptable
- ✅ Fixed platform cost + variable usage works for you
Switch to Stammer AI if:
- ✅ Chat is primary, voice is secondary
- ✅ Aggressive unit economics matter most
- ✅ Bundled chat + voice + email creates stickiness
- ✅ 1,300+ agency community provides value
Industry Quick Guide
Home Services (HVAC, Plumbing, Electrical)
Problem: 30-40% of calls happen after hours. Seasonal spikes crush Synthflow's minute bundles.
Solution: Convocore — all-in-one pricing handles July AC rushes without overage anxiety. Smart Handoff routes true emergencies to on-call techs.
Typical Results: 25-35% increase in booked appointments from AI handling off-hours.
Healthcare (Dental, Clinics, Specialists)
Problem: HIPAA compliance required. Synthflow's compliance certifications need verification.
Solution: Retell AI or Convocore — both offer HIPAA compliance options. Verify current certifications before deployment.
Typical Results: 50-70% reduction in front desk call volume.
Legal (Law Firms, Intake)
Problem: Speed to lead matters. After-hours PI calls go to competitors.
Solution: Convocore for multi-channel (voice + chat), Retell AI for complex intake flows with IVR.
Typical Results: 40-60% reduction in cost per qualified lead.
Real Estate
Problem: Leads come from Instagram, WhatsApp, AND phone. Synthflow only handles one.
Solution: Convocore — only platform covering all lead sources from one dashboard.
Typical Results: Lead response time drops from hours to seconds.
Migration Checklist: Leaving Synthflow
If you're switching, plan carefully:
Week 1: Document
- Export all conversation flows and configurations
- List every integration (CRM, calendar, webhooks)
- Calculate actual monthly costs including overages
- Identify highest-risk clients to migrate last
Week 2: Setup
- Configure new platform with white label branding
- Recreate integrations (test with real data)
- Build templates for common client configurations
- Set up billing/rebilling systems
Week 3: Test
- Deploy with one low-risk client
- Run parallel with Synthflow for comparison
- Test all edge cases (transfers, after-hours, integrations)
- Document any differences in behavior
Week 4: Migrate
- Begin client migrations (simple → complex)
- Communicate "system upgrades" to clients
- Monitor closely for first 30 days
- Celebrate margin improvements
FAQ
What's the actual cost difference between Synthflow and alternatives?
For 10,000 minutes/month: Synthflow costs ~$1,880 (with overages). Convocore costs ~$920. Retell AI costs ~$850. Annual savings range from $7,500-$12,000.
Can I migrate existing clients from Synthflow?
Yes. Plan 2-4 weeks for full migration. Export flows, rebuild on new platform, run parallel testing, then switch. Most platforms can import knowledge bases and conversation data.
Which platform has the best voice quality?
Synthflow, Convocore, and Retell AI are all consistently rated high for voice naturalness. The differences are marginal—choose based on pricing model and features, not voice quality alone.
Do I need technical skills?
Convocore, Synthflow, and Stammer AI: No. Designed for non-technical operators. Retell AI: Some. BYOC requires understanding telephony basics. VoiceAIWrapper: Some. Managing multiple providers adds complexity.
What about compliance (HIPAA, SOC 2)?
Synthflow, Retell AI, and Convocore offer compliance options. Always verify current certifications directly—compliance status changes. Enterprise plans typically include compliance; starter plans may not.
Is Synthflow actually bad?
No. Synthflow works well for voice-only agencies with predictable volumes and tolerance for occasional overages. The alternatives solve specific problems: unpredictable costs, multi-channel needs, or branding concerns.
The Bottom Line
Synthflow built a solid voice AI platform. The no-code builder works. Voice quality is good. Many agencies succeed with it.
But the pricing model creates anxiety. The voice-only limitation loses deals. The branding leaks create awkward conversations.
For agencies hitting these specific pain points:
- Overages unpredictable? → Convocore's all-in-one pricing
- Need multi-channel? → Convocore (only option with voice + chat + social)
- Want maximum control? → Retell AI's BYOC model
- Brand invisibility critical? → VoiceAIWrapper's multi-provider approach
- Chat-first clients? → Stammer AI's bundled approach
The agencies growing fastest in 2026 aren't platform-loyal. They're margin-loyal. They choose tools that protect profitability and expand capabilities.
Synthflow works for some. The alternatives work better for others. Match the platform to your business model, not to who has the best marketing.
Last updated: January 2026