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Personas library: the built-in AI Beta Readers

Last updated May 27, 2026 · 4 min read

The key knob for AI Beta Readers is "pick readers" — which personas to simulate. Slima ships a fixed set of beta readers, each representing a different way of reading.

AI Beta Readers reader selection: the reader roster laid out as cards, filterable by gender, picked one by one or with Select All

The built-in readers

Each is a critic lens (a fictional character, not a real person), watching for something different:

Reader Lens Cares most about
Alex ♂ Logic Detective plot holes, broken logic
Marcus ♂ Sharp-Tongued Critic very hard to impress
Daniel ♂ Emotional Resonator character chemistry and emotion
Leo ♂ Lore Fanatic worldbuilding consistency
Victoria ♀ Prose Aesthete elegance of the prose
Olivia ♀ Speed Reader impatient — drops fast
Mia ♀ Casual Reader authentic mainstream reaction
Nina ♀ Foreshadowing Hunter whether twists are earned

Names and avatars are fictitious, just for recognition — what matters is each reader's lens.

How to pick

A few strategies:

Want the mainstream reaction

Pick Mia (casual reader) + Olivia (impatient speed reader) — closest to real bookstore readers. If even Olivia keeps going, your pacing is fine.

Want a stress test

Pick Marcus (hard to impress) + Alex (hole-catcher) — the strictest bar. Pass them and most readers will follow.

Target your book's weak spot

  • Worried the world isn't clear → Leo
  • Worried characters are flat → Daniel
  • Worried about the prose → Victoria
  • Worried twists feel unearned → Nina

Want full coverage

Hit Select All — it works down the list and fills your selection up to whatever your plan allows, which is the widest coverage you can get in one run.

Can I add custom personas?

Not in the current version. Different combinations of the built-in readers already cover most lenses you'd want to test.

How many at once

How many readers you can pick per run depends on your plan — see Persona simultaneous limit and upgrade.

Related

Try it in Slima

Open the app and do this with your own book. Free to start, no credit card.

Open Slima
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