Comparison

The SIX vs NForge

Price, ratings, monetisation and update history for both apps, side by side โ€” with what reviewers say about each.

Head to head
About

The SIX

Features
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The SIX is the new way to rate your fitness. Built in collaboration with Gymshark, The SIX gives you a single performance rating across key pillars of fitness so you can finally show how good you really are in the gym. No guessing. No ego. No noise. Just your data, your effort, your proof. What you can do inside The SIX: * Complete structured fitness tests that cover strength, power, speed, capacity, endurance, and conditioning * Get your personal SIX rating based on your results * Track your progress over time as your rating increases * Create head to head comparisons with friends to see who wins, loses, or ties across each of The SIX * Record in-app video of your attempts so others can watch your lifts and efforts * Learn correct technique from Gymshark Lifting Club coaches with built-in movement guides and videos * Share achievement stickers and rating cards straight to Instagram and other social channels for social proof * Build social currency around your effort, not just your appearance * Compete on leaderboards and see where you stand The SIX creates a democratised rating for fitness. It gives every lifter and gym goer one clear number that reflects real performance, not opinion. Your training already matters. Now it counts. What is your SIX?

About

NForge

Features
Read full description

NForge provides free software for fitness coaches and studios: client management, live online and in-person classes, AI-generated workout and nutrition programmes (Forge AI), a public marketplace for coach profiles and training plan sales, and automated payments. 7.9% platform fee on successful transactions โ€” no monthly fees. One app instead of a stack of subscriptions: clients, programs, nutrition, classes online and in person, invoicing, and a storefront that sells your plans. There are no client limits and no feature gates. NForge takes 7.9% when a client pays you, and payouts typically reach your bank within 24 hours. Earn nothing in a month, pay nothing. FORGE AI: PROGRAMS WRITTEN IN MINUTES Answer a short intake about your client: goals, experience, injuries, allergies, equipment and weekly schedule. Forge AI drafts the whole program, up to 12 weeks of progressive training with sets, reps, tempo and rest, plus optional nutrition with daily macro targets and meals portioned to hit them. Every plan passes layered safety checks and an independent AI safety review, and anything that needs a professional eye arrives flagged with specific notes. You review, edit and send. It goes out under your name. Included free: one generation per client per day, up to ten a day per coach. PROGRAMS THAT LOOK PROFESSIONAL Build reusable workouts with sets, reps, tempo, rest and prescribed load, including supersets. Combine training and nutrition into week-by-week programs, assign them to a client, set your price, and NForge delivers a polished PDF when they pay. NUTRITION THAT ADDS UP Create meal plans with automatic calorie and macro calculation. AI-generated days carry daily targets for calories, protein, carbs, fat and water, with meals sized so the day actually meets them. CLASSES, ONLINE AND IN PERSON Host HD video classes for up to 50 from your phone, or run bootcamps, park sessions and studio schedules on the same rails. You get five recurrence patterns, timezone-aware scheduling, and a public booking page for every class. Clients book, pay and join from a link, with nothing to download on their side. Mark an in-person session done and session credits are consumed automatically. GET PAID WITHOUT CHASING Invoicing runs on Stripe in multiple currencies: one-off invoices, scheduled invoices, program invoices and class memberships with session credits. Clients top up from the same link, with card details saved at checkout. SELL YOUR PLANS, GET DISCOVERED Open your public storefront at your own handle, list your programs for sale, and get found in the NForge coach directory. When a plan sells, the same 7.9% applies. There is no extra marketplace commission. CLIENTS IN ONE PLACE Unlimited client profiles with goals, health notes, emergency contacts and full program history. Built for independent PTs, online coaches, hybrid coaches, group fitness instructors, yoga and pilates teachers, nutrition coaches and small studios. Download NForge and send your first program this week. No card details, no monthly fee. Built in the UK by Quantum Craft LTD.

Screenshots

The SIX4 screens
NForge4 screens

Verdict

The call

The SIX and NForge are too close to call on the numbers: across 6 compared parameters โ€” price, update cadence, ads and in-app purchases among them โ€” neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on November 5, 2026 and October 28, 2026 respectively.

ScorecardNo meaningful differences
The SIX versus NForge: the parameters behind the verdict, then further details
ParameterThe SIXNForge
PriceFreeFree
Update frequencyWeeklyWeekly
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.615.0 โ€” better
Further details โ€” not scored
Size99 MB57 MB
Age rating17+12+
DeveloperArchon Combine LimitedQuantumCraft Ltd

In-app purchases

None

The SIX

No in-app purchases

None

NForge

No in-app purchases

Questions

Is The SIX free?
The SIX is free to download, with no in-app purchases.
Is NForge free?
NForge is free to download, with no in-app purchases.
Do The SIX or NForge have ads?
Neither The SIX nor NForge shows ads.
Which is updated more often, The SIX or NForge?
The SIX ships an update weekly, and NForge weekly. Most recently, The SIX was updated on November 5, 2026 and NForge on October 28, 2026.

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