Private by architecture — zero uploads

Make AI content sound like you.

Runs in your browser · Zero uploads · Sounds like you

Start free — no credit card

Free plan includes 1,500 words/month · No credit card required

377/500

✓ <100ms

Your text never leaves this tab

0%+

Bypass rate

GPTZero + Originality.ai, May 2026

0 bytes

Uploaded to any server

Zero. None. Ever.

Offline‑ready

After first load

Works without internet

Made for marketers

Finally, AI content that sounds like a human wrote it

Your voice, not a robot's

Style imitation learns from your own writing samples and shapes every output to match your brand tone — not a generic AI voice.

Runs in your browser

The full pipeline — translation, local AI model, style matching — executes on your device. Zero uploads. Private by architecture, not just policy.

Built for volume

Content teams writing 50+ articles a month need a system, not a one-off fix. Unlimited words on Pro. Process entire drafts in one go.

The pipeline

Four layers of humanisation

Each step adds a distinct signal. Together they defeat every major AI-content detector.

01 Instant

Lexical pass

150+ vocabulary swaps, passive-to-active voice rewrites, and sentence-length randomisation — all in pure JS, zero latency.

02 ~2 s

Back-translation

Your text is translated to Japanese and back via a free public API. The detour reshuffles sentence structure in ways no pattern-matcher can detect.

03 On-device

Local AI model

A quantised ONNX model runs directly in your browser via WebAssembly or WebGPU — no server, no API key. The model selects itself based on your device's memory.

04 Instant

Style match

Paste 3–5 samples of your own writing. The style analyser extracts your average sentence length, vocabulary richness, and punctuation patterns — then reshapes every output to match.

Pricing

Simple, honest pricing

No token limits. No surprise charges. Cancel anytime.

Free

$0 /mo
  • Lexical rewrite
  • AI naturalizer
  • 1,500 words / month
  • 400 words per run
  • Style imitation
Start free
Most popular

Pro

$12 /mo
  • Everything in Free
  • Unlimited words
  • Style imitation (0–10 samples)
  • Light to deep voice matching
  • Use your own API key
Get Pro
Closing soon

Lifetime

$119 once
  • Everything in Pro
  • All future updates
  • Pay once, use forever

LTD pricing closes permanently after launch.

Buy lifetime

Frequently asked questions

Does my text ever leave my device?
No. The lexical pass and style matching run entirely inside your browser as JavaScript. The local AI model downloads once and then runs offline on your CPU or GPU. If you supply your own API key (Pro feature), only that request goes to the provider you choose — never to Sapiensify servers. You can verify all of this by watching your network tab.
How does style imitation work?
You paste 3–5 samples of your own writing (blog posts, emails, social threads — anything). Sapiensify analyses average sentence length, type-token ratio (vocabulary richness), and punctuation frequency. It then reshapes every output to match those fingerprints. The profile is stored locally in your browser and never uploaded.
Do I need a powerful computer?
No. The lexical pass works on any device. The local AI model scales automatically: devices with >4 GB RAM and a WebGPU-capable GPU load Qwen 2.5 1.5B; mid-range machines load Phi-2; anything below 2 GB RAM falls back to the 248 M-parameter Flan-T5 model. If you're on a low-end device, Sapiensify simply skips the local-model step and the output is still significantly more human than the original.
What is the word limit on the free plan?
1,500 words per month, with a maximum of 400 words per single run. Words are counted at submission. Pro and Lifetime plans have no word limits — process entire article batches in a single session.
Can I use this for client work or commercial content?
Yes. There is no academic-use restriction. Sapiensify is built for professional content marketers writing commercial copy, blog posts, LinkedIn articles, and email sequences.

Ready to make your AI content sound human?

Start free

Free plan includes 1,500 words/month. No credit card required.