Concept & Prototyping Sprint
2 weeks · from £6,500A focused two-week sprint that turns a one-line idea into a playable TestFlight build. Includes core-loop design, three art directions and a go / no-go recommendation.
iOS Games Studio — Shoreditch, London
We forge iOS games that earn a place on the home screen.
Fortress Sentinel Forge is an independent studio designing, building and launching original App Store titles — from the first paper prototype to live-ops and beyond.
- 18
- Titles shipped on the App Store
- 12M+
- Downloads across our catalogue
- 4.7★
- Average App Store rating
Our Mission
Small studio, obsessive craft, games that respect your time.
Founded in 2016 above a coffee roaster on Rivington Street, we build games the way we wish more studios did — hand-tuned by a team of eleven who care about the twelfth second as much as the first. Every mechanic is playtested until it feels inevitable, every frame runs at 60fps on a five-year-old iPhone, and every monetisation choice is one we would be happy to explain to a player face to face.
Native, not ported
Built in Swift and Metal for iOS first, so performance and battery life never feel like an afterthought.
Fair by design
No dark patterns, no predatory loot boxes. Premium and honest free-to-play models only.
Made in London
One studio, one time zone, one team you can actually visit for a flat white and a playtest.
What We Do
End-to-end iOS game development, under one roof.
Engagements run from a two-week prototype sprint to multi-year live titles. Day rates and fixed-scope packages both available.
Full Game Production
4–9 months · from £75,000Complete design, Swift & Metal engineering, original art and audio, and App Store submission. We ship the whole thing and hand you the keys.
Live-Ops & Retention
Monthly retainer · from £4,200/moSeasonal events, A/B-tested economy tuning, push campaigns and weekly content drops that keep day-30 retention healthy long after launch.
Porting & Performance Rescue
6–10 weeks · from £28,000Bring an existing Unity or web game to iOS the right way — 60fps, small binary, ProMotion and Dynamic Island support, and a passing App Review.
Case Studies
A few titles we forged from scratch.
Studio hours: Mon–Fri, 9:30–18:00 GMT. Studio visits and playtests welcome by appointment.
Tower defence · Premium
Rampart Rush
A hand-drawn medieval defence game that hit #3 in Strategy across 14 countries and a 4.8★ rating from 22,000 reviews.
Puzzle · Free-to-play
Neon Cartographer
A minimalist maze-drawing puzzler with 240 handcrafted levels and an Apple Arcade-style no-ads model. 3.1M downloads.
Arcade · Live title
Sentinel Skies
An endless aerial dogfighter with weekly squadron events. Featured by Apple in "Games We Love" three times.
Narrative · Premium
Foundry Tales
A choice-driven story game about a Victorian iron foundry, built with a bespoke branching-dialogue toolkit. Editors’ Choice, UK.
Kind Words
Founders and publishers we have shipped alongside.
“They took our napkin sketch and had a playable build on my phone in nine days. Rampart Rush went on to fund the whole studio. The Forge team simply gets iOS.”
Harriet L.
Founder, Bastion Play — Manchester
March 2024
“We came in with a Unity game that ran hot and drained batteries. They rebuilt the render path in Metal and shipped a butter-smooth 60fps port that passed review first time.”
Daniel O.
Head of Mobile, Kite & Anchor — London
November 2023
“Their live-ops retainer lifted our day-30 retention from 9% to 21% in a single quarter. Every change was explained, measured and reversible. No smoke, no mirrors.”
Priya S.
Product Lead, Lanterna Games — Bristol
July 2024
Get In Touch
Tell us about the game you want to build.
Whether you have a fully written design doc or a single sentence scribbled on the Overground, we would love to hear it. Drop us a line and we will get back within two working days.
Phone
+44 20 3302 7465Email
[email protected]Studio
58 Rivington Street, Shoreditch, London EC2A 3QQ
Hours
Monday–Friday, 9:30–18:00 GMT