Is Phaserr a replacement for Liftosaur?

For self-coaching, not really — Liftosaur is excellent at that job, and if you only train yourself its scriptable control is hard to beat. Phaserr replaces it when the job changes: the moment you program for other people, you need their logging, 1RM histories, and progress in front of you, which Liftosaur structurally doesn't provide.

Can I coach clients with Liftosaur?

Only one-way. Liftosaur lets you share a program link that a client imports into their own account, but there is no coach dashboard, no roster, and no way to monitor what they actually lift — their logs and maxes stay in their account. That's the specific gap a coaching platform exists to close.

How much does Phaserr cost compared to Liftosaur?

Phaserr is free. Liftosaur has a free core tier, with a paid Premium available monthly, yearly, or as a one-time lifetime purchase; prices are localized per country, so check the app for your exact figure.

Does Phaserr have a scripting language like Liftoscript?

No — and that's deliberate. Phaserr expresses progression through blocks, %1RM and RPE prescriptions, and an AI assistant that drafts and edits programs at your direction, so coaches get flexible periodization without writing or maintaining code.

Alternatives

A Liftosaur alternative for coaching, not just self-coaching

Liftosaur deserves its cult following. It's an open-source, scriptable weightlifting tracker — 'Google Sheets and Strong in the same app' — where a lifter can program almost any progression logic in Liftoscript, with %1RM, RPE, and automatic weight adjustments built in.

But it's built for coaching yourself. The moment you program for other people, the structural gap shows: you can hand someone a program link, but their logs, maxes, and progress never come back to you. Phaserr is built around exactly that loop — the coach authors periodized blocks, %1RM and RPE loads resolve from each athlete's own 1RM history, and every logged session feeds the next session's prescriptions.

What Liftosaur does well

Liftosaur is an open-source (AGPL-3.0) tracker by independent developer Anton Astashov, actively maintained and aimed at tech-savvy, self-coached lifters. Its Liftoscript language makes progression logic fully programmable; it supports %1RM and RPE, ships 16+ built-in programs (5/3/1 for Beginners, GZCLP, Texas Method, GZCL variants), and covers the practical details well: per-set logging, weekly volume by muscle group, a plates calculator, offline mode, and iOS/Android/web apps with a free core tier and a lifetime-purchase option.

Phaserr vs Liftosaur at a glance

	Phaserr	Liftosaur
Built for	Coaches programming for real athletes — rosters, periodized blocks, and a logging loop per athlete.	Self-coached lifters, explicitly pitched as a tracker 'for coders' — you author and run your own program.
Program building	Block periodization is the core object: plan the macrocycle, phase the blocks, build sessions inside them — with an AI assistant that understands periodization, no scripting required.	Liftoscript, a purpose-built scripting language for custom progression logic, plus 16+ ready programs (5/3/1, GZCLP, Texas Method, GZCL family). Periodization is fully programmable but authored by hand in code.
Loading methods	%1RM and RPE prescriptions computed from each athlete's dated 1RM history — a new tested max updates tomorrow's working sets.	%1RM and RPE supported, with scriptable linear, double, and rep-sum progressions that auto-adjust weights after workouts — for the lifter's own account.
Coach–athlete loop	Athletes log in Phaserr; the coach sees actuals, AMRAPs, and 1RM histories, and the next session's loads adjust from them.	One-way: you can share a program link that others import, but there is no coach dashboard, no athlete roster, and no visibility into what recipients actually lift.
Logging & tools	Set-by-set actuals, AMRAPs and test days captured; logging feeds directly into the next session's loads.	Strong self-tracking: per-set logging, weight/volume graphs, weekly volume by muscle (prescribed vs completed), body measurements, plates calculator, offline mode with sync.
Openness & pricing	Free.	Open source (AGPL-3.0) with a free core tier; paid Premium offered as monthly, yearly, or one-time lifetime purchase, with prices localized per country.

Liftosaur details verified on 2026-07-04. Sources: Liftosaur homepage (features, programs, %1RM/RPE) (checked 2026-07-04) , Liftosaur docs index (Liftoscript, API — no coaching layer) (checked 2026-07-04) , Liftosaur program sharing page (one-way links) (checked 2026-07-04) , GitHub: astashov/liftosaur (AGPL-3.0, activity) (checked 2026-07-04) .

Which one is for you

Choose Liftosaur if…

You train yourself, enjoy programming your own logic, and want total control down to scriptable set rules.
You run well-known templates (5/3/1, GZCLP, Texas Method) and want them tracked with auto-progression for free or a one-time purchase.
Open source and data ownership matter to you.

Choose Phaserr if…

You coach other people and need their logs, maxes, and progress flowing back to you — not a one-way program link.
You think in periodized blocks and want %1RM/RPE loading handled per athlete, from each athlete's own 1RM history.
You want periodization tooling in a visual builder with an AI assistant, without maintaining progression code.

Moving from Liftosaur to Phaserr

This move usually isn't away from Liftosaur — it's outgrowing self-coaching. When you start programming for others, the logic you scripted for yourself becomes the blocks you assign to athletes.

Write down the progression logic from your Liftoscript programs: the split, the loading scheme, and when weights move.
Rebuild that structure in Phaserr as blocks — the AI assistant drafts mesocycles from your split and goals, and you adjust from there.
Enter each athlete's current maxes (or run a test day) to seed their 1RM history.
Invite your athletes and start logging — from the first session, their actuals feed the loads Phaserr prescribes next.

Frequently asked questions

Is Phaserr a replacement for Liftosaur?: For self-coaching, not really — Liftosaur is excellent at that job, and if you only train yourself its scriptable control is hard to beat. Phaserr replaces it when the job changes: the moment you program for other people, you need their logging, 1RM histories, and progress in front of you, which Liftosaur structurally doesn't provide.
Can I coach clients with Liftosaur?: Only one-way. Liftosaur lets you share a program link that a client imports into their own account, but there is no coach dashboard, no roster, and no way to monitor what they actually lift — their logs and maxes stay in their account. That's the specific gap a coaching platform exists to close.
How much does Phaserr cost compared to Liftosaur?: Phaserr is free. Liftosaur has a free core tier, with a paid Premium available monthly, yearly, or as a one-time lifetime purchase; prices are localized per country, so check the app for your exact figure.
Does Phaserr have a scripting language like Liftoscript?: No — and that's deliberate. Phaserr expresses progression through blocks, %1RM and RPE prescriptions, and an AI assistant that drafts and edits programs at your direction, so coaches get flexible periodization without writing or maintaining code.

Liftosaur is a product of Anton Astashov. Phaserr is not affiliated with or endorsed by Anton Astashov. Competitor pricing and features change — check the linked sources for current details.