Fallen London Companion

Quality of Life improvements for Fallen London.
I lost my mind so you could keep yours.

Get for Firefox Get for Chrome

Firefox works on desktop & mobile · Chrome works on desktop only

◆Echo Intelligence Automatically see items echo value before using them and after gaining them, and track your EPA (session or lifetime). ◆Bone Market Assistant See top buyer + expected echoes for current recipe, bone attributes, warnings for exhaustion and mania compatibility. ◆Smarter UX One click optimal loadout, Faction renown bar, Cross-conversion bar, Fast nav to items, Inline exact CP change, Rat market saturation thresholds.
Animated demo: echo values, branch cost previews, and CP gains appearing on Fallen London actions
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The Bone Market
Assistant

The Bone Market is Fallen London's most complex profit system. I lost my mind so you could keep yours, and built a live Bone Market dashboard, guidance and warnings to avoid painful actions like forgetting your skeleton already had 2 arms and having to declare it a chimera.

As you build your skeleton, a live panel tracks every quality: Antiquity, Amalgamy, Menace, Implausibility, and limb counts. The top five eligible buyers are ranked by echo value and recalculated after every bone you add, and we show the actual outcome per buyer before you actually sell your skeleton. Warnings on bones that would break the mania of the week or push you one level higher in exhaustion before you do it.

Each bone is annotated with the attribute points it contributes, so you always know whether that Horned Skull pushes Menace over the threshold before you commit to it.

Top 5 buyers ranked live Bone-by-bone attribute tracking Exhaustion and mania incompatibility warnings
Bone Market assistant with key features highlighted — buyer rankings, echo values, and exhaustion warnings Bone-by-bone attribute annotations — antiquity, amalgamy, and menace contributions highlighted on each bone
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Echo Intelligence:
every number, visible

No more guessing what each item is worth, whether before making the choice (tooltip showing the echo value on every item), or after making the choice (inline +XX echoes gained on each storylet result). All values smartly converted into echoes, no more remembering the stuivers to echo, scrip to echo, rat shillings, khaganian coinage conversions to echo to know if your choice was efficient. And inside the myself tab, you get an EPA tracker: what's your lifetime EPA ? what's the EPA on this current session, when you are curious about the real life efficiency of your grinding strategies.

Echo value on every result Net total per action Branch cost preview CP gain annotations EPA tracker — session & lifetime
Echo value annotations on action results, showing gains, losses, and net total Branch cost preview — echo cost tooltip on a quality requirement icon
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Smarter UX:
fewer taps, more game

A set of shortcuts and at-a-glance panels that cut the navigation overhead out of your session.

The Optimal Loadout button appears next to every challenge icon — one tap equips your best items for that particular skill, and the success percentage updates in place so you know immediately whether it helps. The Faction Renown Bar puts favours and renown scores for every faction at the top of Possessions, always visible. No more losing favours because you are at 7/7, no more guessing what's the right faction item to convert into reputation and where that item is. The Cross-Conversion Bar helps midgame players go through the T3 cross conversions to make waves easily. A Jump to Items link skips straight past your possessions to your item inventory, helpful for those who have a ton of gear and companions.

Optimal Loadout (+) Faction Renown Bar Cross-Conversion Bar Jump to Items
Faction renown bar and cross-conversion bar in the Possessions tab Smart Loadout button highlighted on a challenge icon — one tap equips the best gear for that skill
01
Add to your browser

Click "Get for Firefox" or "Get for Chrome" and confirm the browser prompt. One click, no account required.

02
Open Fallen London

Navigate to fallenlondon.com, or refresh if you already have it open. That's it.

03
Start playing

Every feature activates automatically. No settings panel, no accounts, no configuration needed.

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Mobile First

Built for Firefox
Android first

Every feature works on mobile. Sticky panels, tap-friendly overlays, responsive layout — optimized for the phone underground.

Firefox for Android 109+
Jump to items feature on mobile Firefox — one-tap navigation
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Zero Botting.
Zero Automation.

The Companion reads the game's own API responses. It never sends a request to api.fallenlondon.com from outside the game, never triggers an action, never touches your account. 100% client-side. 100% open source.

🚫  No Automated Requests 🔒  Client-Side Only 📂  Open Source
Common Questions

Frequently Asked

Will this get my account banned?

No. The extension never automates actions, never sends requests to Failbetter's servers from outside the game, and only modifies your local browser view. Failbetter explicitly permits client-side quality-of-life modifications.

Does it automate anything?

Nothing. Every action in the game is still taken manually by you. The extension reads the game's own API responses and displays information — and is never performing any in-game action on your behalf.

Does it work on mobile Firefox?

Yes — Firefox for Android is the primary development target. Every feature is designed and tested for mobile first.

How do I know the extension is safe?

The source code is fully open on GitHub. The extension requests only the storage permission (to save your EPA data between sessions) and has no network permissions — it cannot make requests to any server.

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Open Source

Found something? Want to dig deeper?

Browse the source, file an issue, or fork it. Pull requests welcome.

View on GitHub →