Folium
by Jarrod Norwell
- Entertainment
- Paid
- Rating
- 2.4
- 843 ratings · US storefront
- Top 69%among 138 Entertainment apps
- Last update
- Oct 4, 2026
- Version 2.2
- Size
- 68 MB
- Category
- Entertainment
- Tracked since
- Oct 9, 2026
Estimated revenue
A model estimate with a likely range, not a reported figure.
No estimate. Apps outside the grossing charts, and some countries, have no reliable rank-to-revenue curve, so we show nothing rather than a guess.
How this estimate is made
Rank: we take the app's best Top Grossing rank on the latest chart day. Category ranks are converted into an equivalent overall rank, because a #10 in Finance earns far less than a #10 overall.
Curve: that equivalent rank is read off a rank-to-revenue curve anchored on public company revenue and market-data reports for the US iPhone App Store.
Country: the curve is scaled per country (Japan is roughly a third of the US, Türkiye under 1%). Where we have no scale, such as China, there is no estimate.
Range: the likely range widens with country, category and chart depth. It is a plausible span, not a statistical confidence interval.
Not included: ads, payments outside the App Store, and any difference between gross sales and what the developer keeps. Low confidence means indirect data; medium means several independent sources agree.
Full methodScreenshots
As shown on the App Store listing.
About this app
Text from the App Store listing.
Folium is a beautifully designed, high performing multi-system emulation app bringing retro console and handheld gaming to Apple devices
Supported Systems
Bandai
- WonderSwan
- WonderSwan Color
Coleco
- ColecoVision
Nintendo
- 3DS
- DS
- Game Boy
- Game Boy Advance
- Game Boy Color
- Nintendo Entertainment System
- Super Nintendo Entertainment System
SEGA
- Genesis
- Mega Drive
Sony
- PlayStation 1
Supported Game Controllers
Backbone
- One
Nintendo Switch
- Joy-Con
- Pro Controller
PlayStation
- DualSense
- DualShock 4
Xbox Series
- S
- X
https://apple.com/legal/internet-services/itunes/dev/stdeula
What’s new
Release notes for the latest version, as written by the developer.
Added
- a pull-to-refresh gesture that repopulates games across all available systems
- functional left and right analogue sticks for PlayStation 1 emulation, including diagonal movement
- load and save states for ColecoVision, Game Boy, Game Boy Color, Game Boy Advance, Nintendo and Super Nintendo Entertainment System, and WonderSwan
- a new selection option in Application settings to choose the system shown at launch
- new graphics settings for Game Boy, Game Boy Advance, and Game Boy Color
- new Nintendo DS settings to toggle boot screen skipping and select the console model
- PlayStation 1 emulation support for Ape Escape and Gran Turismo 2
- PlayStation 1 support for CHD, IMG, and ISO formats, with artwork retrieval and caching where available
Changed
- from Avocado to my own fork with much of the code rewritten
Fixed
- a crash in PlayStation 1 emulation when exiting a game or launching a new one immediately after
- an issue where Nintendo 3DS titles were read from file names instead of embedded headers
- a blue tint in the rendered image in SEGA Genesis emulation
Miscellaneous
- replaced Cherry’s base from Gearcoleco with MesenCE and rewrote part of the bridging code
- updated Cytrus to the latest version, adding features and improving performance
Rank history
Daily position in the France charts. #1 is at the top.
- Best rank
- #2
- Current rank
- #5
- Days charting
- 7 of 7
On the charts today
Small & simple score
How realistic it is for a small team to build something like this.
77/100
Not flagged as small & simple
- Developer size40% · 25
Developer: 3 apps on the charts
- Audience size80% · 20
Ratings: 843
- App size60% · 10
Size: 68 MB
- Price model100% · 15
Price model: paid
- Demand proof100% · 30
Best rank #1, 148 countries
An indicator, not a fact. We can't see team size. Calculated Oct 24, 2026 · method i2
How the score worksVersion history
- 2.2LatestReleased Oct 4, 2026