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Alternatives · AI assistants
Retell AI alternatives
The best Retell AI alternatives in AI assistants, ranked by Sparkpulse's velocity_score.
Updated Aug 18, 2026
Looking for the best alternatives to Retell AI? Sparkpulse tracks and ranks 12 alternatives in AI assistants by shipping velocity — how frequently each ships meaningful updates, verified from official changelogs. For reference, Retell AI shipped 0 meaningful updates in the last 30 days and carries a velocity score of 0.0 out of 10 in 2026. The alternatives below are ranked the same way, so you're comparing real release momentum, not marketing claims.
About Retell AI
Voice-AI platform building toward composable, flexibly-routed agents
Retell builds voice AI agents, and the captured releases (through early 2026) center on making complex agents maintainable and adaptive: Agent Transfer for handing context between modular agents, Flex Mode for non-linear flow navigation, reusable Flow Components, and node-level knowledge bases. Add to that a chat widget, an AI QA Analyst, and periodic pricing adjustments.
Velocity 0.0 · Last update 1mo ago
Top 12 alternatives to Retell AI
Ranked by recent ship velocity. Tap any card for the full editorial breakdown, or pivot to a head-to-head.
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OpenRouter's feed turns to documentation of the routing and image work it already shipped
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ONNX Runtime is dismantling itself into plug-ins — CUDA is now the one that ships separately.
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InvokeAI's video release is on its second candidate, now with Intel GPUs in scope.
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Docling keeps swallowing new formats, and now the parsing engines behind them are swappable.
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The Palmyra X6 launch lands twice — once as a digest, once as a press release
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NEURONwriter is publishing the AI-search playbook faster than it is shipping the tool.
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D-ID's feed is comparison marketing, with simpleshow folded into the pitch
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Pictory publishes usage data from 1.5 million videos, but its feed carries no releases
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The v2 rewrite has shipped; Cherry Studio is back to patch releases.
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Alhena is building the scoreboard for shopping agents it also competes in.
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Comet is annexing AI cost governance from the observability side.
Retell AI vs alternatives — shipping velocity at a glance
Velocity score (0–10) and meaningful releases shipped in the last 30 days, from official changelogs. Higher = shipping faster.
| Product | Velocity | Sparks · 30d | Focus areas | Latest release |
|---|---|---|---|---|
| Retell AI (baseline) | 0.0 | 0 | voice-aiconversation-flowsagent-composition | Flex Mode for Conversation Flows |
| Gemini | 10.0 | 1 | llmconsumer-aimodel-releases | Introducing Gemini 3.7 Flash |
| OpenRouter | 7.5 | 1 | llm-gatewaymodel-routingimage-api | Model Routing Powered by Wisdom of the Market |
| ONNX Runtime | 7.5 | 2 | execution-providersplugin-architecturecuda | CUDA becomes a standalone plug-in execution provider |
| InvokeAI | 6.3 | 1 | image-generationvideo-generationself-hosted | InvokeAI 6.14.0 RC1 adds Wan 2.2 video generation and multi-GPU |
| Docling | 6.3 | 0 | document-parsingformat-coveragepluggable-engines | — |
| Writer | 6.3 | 1 | enterprise-aiagentspalmyra | Palmyra X6, a faster agent, and AI Studio governance |
| NeuronWriter | 5.0 | 0 | ai-searchgenerative-engine-optimizationcontent-optimization | — |
| D-ID | 5.0 | 0 | ai-avatarsai-videocontent-marketing | — |
| Pictory | 5.0 | 0 | ai-videocontent-marketingtool-comparison | — |
| Cherry Studio | 5.0 | 0 | desktop-ai-clientv2-rewritedata-migration | — |
| Alhena AI | 5.0 | 0 | agentic-commercebenchmark-researchai-visibility | — |
| Comet | 5.0 | 0 | opikagent-observabilitycost-intelligence | — |
The 12 best Retell AI alternatives, in depth
1. Gemini · velocity 10.0
Gemini's product news arrives buried in a consumer marketing feed.
Over the last 30 days Gemini shipped 1 meaningful update vs Retell AI's 0, most recently “Introducing Gemini 3.7 Flash”. Its velocity score of 10.0/10 blends that with longer-term release cadence.
Where Retell AI leans on voice ai, conversation flows and agent composition, Gemini focuses on llm, consumer ai and model releases.
Over the last 30 days Gemini has been shipping faster than Retell AI — a point in its favour if release momentum matters to you.
2. OpenRouter · velocity 7.5
OpenRouter's feed turns to documentation of the routing and image work it already shipped.
Over the last 30 days OpenRouter shipped 1 meaningful update vs Retell AI's 0, most recently “Model Routing Powered by Wisdom of the Market”. Its velocity score of 7.5/10 blends that with longer-term release cadence.
Where Retell AI leans on voice ai, conversation flows and agent composition, OpenRouter focuses on llm gateway, model routing and image api.
Over the last 30 days OpenRouter has been shipping faster than Retell AI — a point in its favour if release momentum matters to you.
Full OpenRouter trajectory → · Compare Retell AI vs OpenRouter →
3. ONNX Runtime · velocity 7.5
ONNX Runtime is dismantling itself into plug-ins — CUDA is now the one that ships separately.
Over the last 30 days ONNX Runtime shipped 2 meaningful updates vs Retell AI's 0, most recently “CUDA becomes a standalone plug-in execution provider”. Its velocity score of 7.5/10 blends that with longer-term release cadence.
Where Retell AI leans on voice ai, conversation flows and agent composition, ONNX Runtime focuses on execution providers, plugin architecture and cuda.
Over the last 30 days ONNX Runtime has been shipping faster than Retell AI — a point in its favour if release momentum matters to you.
Full ONNX Runtime trajectory → · Compare Retell AI vs ONNX Runtime →
4. InvokeAI · velocity 6.3
InvokeAI's video release is on its second candidate, now with Intel GPUs in scope.
Over the last 30 days InvokeAI shipped 1 meaningful update vs Retell AI's 0, most recently “InvokeAI 6.14.0 RC1 adds Wan 2.2 video generation and multi-GPU”. Its velocity score of 6.3/10 blends that with longer-term release cadence.
Where Retell AI leans on voice ai, conversation flows and agent composition, InvokeAI focuses on image generation, video generation and self hosted.
Over the last 30 days InvokeAI has been shipping faster than Retell AI — a point in its favour if release momentum matters to you.
Full InvokeAI trajectory → · Compare Retell AI vs InvokeAI →
5. Docling · velocity 6.3
Docling keeps swallowing new formats, and now the parsing engines behind them are swappable.
Its velocity score of 6.3/10 reflects longer-term release cadence.
Where Retell AI leans on voice ai, conversation flows and agent composition, Docling focuses on document parsing, format coverage and pluggable engines.
Docling and Retell AI have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
6. Writer · velocity 6.3
The Palmyra X6 launch lands twice — once as a digest, once as a press release.
Over the last 30 days Writer shipped 1 meaningful update vs Retell AI's 0, most recently “Palmyra X6, a faster agent, and AI Studio governance”. Its velocity score of 6.3/10 blends that with longer-term release cadence.
Where Retell AI leans on voice ai, conversation flows and agent composition, Writer focuses on enterprise ai, agents and palmyra.
Over the last 30 days Writer has been shipping faster than Retell AI — a point in its favour if release momentum matters to you.
7. NeuronWriter · velocity 5.0
NEURONwriter is publishing the AI-search playbook faster than it is shipping the tool.
Its velocity score of 5.0/10 reflects longer-term release cadence.
Where Retell AI leans on voice ai, conversation flows and agent composition, NeuronWriter focuses on ai search, generative engine optimization and content optimization.
NeuronWriter and Retell AI have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
Full NeuronWriter trajectory → · Compare Retell AI vs NeuronWriter →
8. D-ID · velocity 5.0
D-ID's feed is comparison marketing, with simpleshow folded into the pitch.
Its velocity score of 5.0/10 reflects longer-term release cadence.
Where Retell AI leans on voice ai, conversation flows and agent composition, D-ID focuses on ai avatars, ai video and content marketing.
D-ID and Retell AI have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
9. Pictory · velocity 5.0
Pictory publishes usage data from 1.5 million videos, but its feed carries no releases.
Its velocity score of 5.0/10 reflects longer-term release cadence.
Where Retell AI leans on voice ai, conversation flows and agent composition, Pictory focuses on ai video, content marketing and tool comparison.
Pictory and Retell AI have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
10. Cherry Studio · velocity 5.0
The v2 rewrite has shipped; Cherry Studio is back to patch releases.
Its velocity score of 5.0/10 reflects longer-term release cadence.
Where Retell AI leans on voice ai, conversation flows and agent composition, Cherry Studio focuses on desktop ai client, v2 rewrite and data migration.
Cherry Studio and Retell AI have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
Full Cherry Studio trajectory → · Compare Retell AI vs Cherry Studio →
11. Alhena AI · velocity 5.0
Alhena is building the scoreboard for shopping agents it also competes in.
Its velocity score of 5.0/10 reflects longer-term release cadence.
Where Retell AI leans on voice ai, conversation flows and agent composition, Alhena AI focuses on agentic commerce, benchmark research and ai visibility.
Alhena AI and Retell AI have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
Full Alhena AI trajectory → · Compare Retell AI vs Alhena AI →
12. Comet · velocity 5.0
Comet is annexing AI cost governance from the observability side.
Its velocity score of 5.0/10 reflects longer-term release cadence.
Where Retell AI leans on voice ai, conversation flows and agent composition, Comet focuses on opik, agent observability and cost intelligence.
Comet and Retell AI have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
Frequently asked questions
What are the best alternatives to Retell AI?
The top Retell AI alternatives we currently track in AI assistants are Gemini, OpenRouter, ONNX Runtime, InvokeAI, Docling, ranked by recent ship velocity.
How is this list of Retell AI alternatives ranked?
Alternatives are ranked by Sparkpulse's velocity_score — release cadence + 30-day spark count + sector-relative ship rate.
Can I compare Retell AI directly with one of these alternatives?
Yes — every card has a "Compare with Retell AI" link to a side-by-side /compare page.