20+ Best Alternatives to Proton in 2026
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Looking for an alternative to Proton? Below are 20 AI startups working in the same space — ranked by our Neuron score so the most credible options come first. Each card shows what makes the tool a viable substitute, pricing signals, and funding stage.
- 1View alternative →
Perplexity
$2.0BAI-powered answer engine delivering real-time, cited responses to complex queries.
Why it's similar: Shares categories with Proton — AI Productivity.
💵 Free
- 2View alternative →
Notion AI
$270MConnected AI workspace
Why it's similar: Shares categories with Proton — AI Productivity.
💵 Free · From $8/mo
- 3View alternative →
Harvey
$2.3BThe AI platform for elite law firms.
Why it's similar: Shares categories with Proton — AI Productivity.
💵 Paid
- 4View alternative →
Genspark
$520MYour all-in-one AI workspace that puts busywork on autopilot.
Why it's similar: Shares categories with Proton — AI Productivity.
💵 Freemium · From $19/mo
- 5View alternative →
Vanta
$504MAgentic trust and compliance automation platform
Why it's similar: Shares categories with Proton — AI Productivity.
💵 Free trial
- 6View alternative →
Grammarly
$1.2BAI writing assistant for individuals and teams.
Why it's similar: Shares categories with Proton — AI Productivity.
💵 Free · From $12/mo
- 7View alternative →
Augment Code
$252MAI agents that understand your entire codebase, from IDE to CLI to code review.
Why it's similar: Shares categories with Proton — AI Productivity.
💵 Paid · From $20/mo
- 8View alternative →
Jasper
$125MAI copilot for enterprise marketing teams.
Why it's similar: Shares categories with Proton — AI Productivity.
💵 Free trial · From $49/mo
- 9View alternative →
Plaud AI
$5MAI voice recorder devices for hands-free note-taking
Why it's similar: Shares categories with Proton — AI Productivity.
💵 Hardware · From $159/mo
- 10View alternative →
Smartling
$383MAI translation and localization platform
Why it's similar: Shares categories with Proton — AI Productivity.
💵 Enterprise · Contact sales
- 11View alternative →
Sentra
$105MCloud-native data security for the AI era
Why it's similar: Shares categories with Proton — AI Privacy.
💵 Enterprise · Contact sales
- 12View alternative →
HeyGen
$65.6MAI video platform with hyper-realistic avatars.
Why it's similar: Shares categories with Proton — AI Productivity.
💵 Free · From $24/mo
- 13View alternative →
Jazz
$61MAI-powered data loss prevention that understands intent, context and risk
Why it's similar: Shares categories with Proton — AI Privacy.
💵 Enterprise · Contact sales
- 14View alternative →
Tines
$146.2MThe intelligent workflow platform to securely scale AI and automation, integrating agents, teams, and tools with speed and control.
Why it's similar: Shares categories with Proton — AI Productivity.
💵 Enterprise · Contact sales
- 15View alternative →
Bold Security
$40MEdge-AI endpoint security that turns every device into an active agent
Why it's similar: Shares categories with Proton — AI Privacy.
💵 Enterprise · Contact sales
- 16View alternative →
Dust
$21MDeploy, orchestrate, and govern fleets of specialized AI agents safely connected to your company's knowledge and tools.
Why it's similar: Shares categories with Proton — AI Productivity.
💵 Enterprise · Contact sales
- 17View alternative →
Cluely
$20.3MAI desktop overlay that listens, sees the screen, and whispers answers in real time.
Why it's similar: Shares categories with Proton — AI Productivity.
💵 Pricing not listed
- 18View alternative →
Legora
$680MCollaborative AI for exceptional lawyers, streamlining research, drafting, and review to deliver greater value.
Why it's similar: Shares categories with Proton — AI Productivity.
💵 Enterprise · Contact sales
- 19View alternative →
InVideo AI
$50MCreate publish-ready videos with a text prompt.
Why it's similar: Shares categories with Proton — AI Productivity.
💵 Freemium · From $20/mo
- 20View alternative →
Wordsmith AI
$30MFleets of legal AI agents that turn in-house legal teams into revenue drivers.
Why it's similar: Shares categories with Proton — AI Productivity.
💵 Enterprise · Contact sales
Frequently asked questions
What are the best alternatives to Proton?
The top-ranked alternatives to Proton on NeuronFeed are Perplexity, Notion AI, Harvey, Genspark, Vanta. Rankings are based on our Neuron score, which weighs funding, momentum and editorial signal.
Is there a free alternative to Proton?
Yes — Perplexity, Notion AI, Grammarly offer a free plans. See the pricing column for each alternative above.
How is this list ranked?
We rank alternatives by shared categories with Proton, then by our proprietary Neuron score (0–100) which combines funding, team quality, momentum, and editorial input. The list refreshes every 30 days.
Proton vs Perplexity — which is better?
It depends on use case. Perplexity (AI-powered answer engine delivering real-time, cited responses to complex queries.) is the #1-ranked alternative. See the full side-by-side at /compare/proton-vs-perplexity.
Explore more around Proton
Contextual paths to related AI startups, deals and rankings.