Fonio AI vs Retell AI — Pricing, Plans, and Verified Costs (2026)
Fonio AI starts at $106/mo. Retell AI starts at Free. Retell AI is $106/mo cheaper on the entry tier than Fonio AI.
How pricing works
These two tools don't price the same way, so the headline numbers below aren't directly comparable until you plug in your own volume.
- Fonio AI (Hybrid) — Fonio AI is hybrid: a fixed subscription from $106/mo plus metered usage on top (Solo). Your real bill moves with volume, not seat count.
- Retell AI (Per Usage) — Retell AI bills purely on usage — PAYG. There is no fixed per-seat fee, so the monthly cost depends entirely on how much you consume.
Per-minute, per-credit and per-token rates exclude any downstream model, speech or telephony costs unless the vendor states otherwise.
German AI phone agent platform priced in EUR. Solo €99 (1,000 min, 1 phone number), Team €299 (3,000 min, 5 concurrent calls), Business custom (100+ calls/day). Prepaid alternative from €0.20/min with €300 minimum top-up. Solo includes €0.15/additional minute. 20+ voices, 25+ languages, unlimited AI assistants across all tiers.
AI voice agent platform. PAYG at $0.07+/min base ($10 free credits, 20 free concurrent calls); real all-in cost $0.13–0.31/min. Enterprise drops to $0.05+/min base rate. Supports GPT-5.x variants and Claude 4.5/4.6 Sonnet; Fast Tier LLM adds 1.5–2× charge for lower latency. Direct competitor to Vapi and Bland AI.
All plans compared
| Tier role | Plan | Fonio AI monthly | Fonio AI annual | Retell AI monthly | Retell AI annual |
|---|---|---|---|---|---|
| Free / starter | Business / PAYG | Free | Free | Free | Free |
| Entry paid | Solo / — | $106 | $106 | — | — |
| Teams | Team / — | $320 | $320 | — | — |
| Enterprise | — / Enterprise | — | — | Custom | Custom |
Tier names differ across vendors. Rows are aligned by tier role, not name. Full tier structures on each tool's page.
What each is best for
Fonio AI is worth it if… European SMBs and mid-market teams that want a German-founded, GDPR-native AI phone agent without navigating US-first platforms like Vapi or Retell. Solo (€99) fits 1–20 calls/day; Team (€299) opens 5 concurrent lines.
Retell AI is worth it if… developers who want a slightly more opinionated voice stack than Vapi — bundled defaults that ship faster, with paid unlocks for premium voices and Fast Tier LLM latency. Free credits make prototyping frictionless.
Bottom line: Choose based on how you want to pay — Fonio AI is hybrid, Retell AI is per usage.
Choose Fonio AI over Retell AI if…
Choose Fonio AI if…
- You're fine with a base subscription plus metered usage on top (from $106/mo).
- You match the profile Fonio AI is built for: European SMBs and mid-market teams that want a German-founded, GDPR-native AI phone agent without navigating US-first platforms like Vapi or Retell.
- You need a general-purpose voice agents & speech/audio option rather than a vertical-specific one.
Choose Retell AI if…
- You want bundled defaults that ship faster than assembling components yourself.
- You're building voice agents where developer experience and UI matter more than stack flexibility.
- You want premium voices and low-latency model tiers behind a simple paid unlock.
At a glance
| Fonio AI | Retell AI | |
|---|---|---|
| Free plan | No | Yes |
| Entry price | $106/mo | Free |
| Enterprise available | No | Yes |
| Pricing model | Hybrid | Per Usage |
| Last verified | September 10, 2026 | September 10, 2026 |
| Full pricing | View full pricing | View full pricing |
Pricing last verified September 10, 2026. Tracked daily.