Comparison

Lambda vs OpenSol

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

Head to head
About

Lambda

This application allows users to play supported games with others on the same local network. Create rooms and connect with nearby players for a direct, low-latency multiplayer experience. It functions as a multi-system game emulator.

Highlights
  • LAN multiplayer support
  • Create game rooms
  • Connect with nearby players
  • Low-latency gameplay
  • Multi-system emulation
Features
Read full description

Lambda is a brand-new game emulator with LAN multiplayer support. LAN multiplayer is one of Lambda's core features. You can create a room on the same local network (the same Wi-Fi environment), connect with nearby players, and play supported games together for a more direct, low-latency gameplay experience. Legal Disclaimer: Lambda is an independently developed emulator app and is not affiliated with, sponsored by, or endorsed by any game publisher, device manufacturer, or content owner. Compatibility descriptions are provided only to explain the app's supported environments. In-App Purchases: Payment will be charged to your Apple ID account at confirmation of purchase. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period. After purchase, you can manage or cancel your subscription in your App Store account settings. Email: jiangdi0924@gmail.com Privacy Policy: https://planthunter.notion.site/58b7b83742254a92ac90aaa06f85398b Terms of Service: https://planthunter.notion.site/1d1282126c6e4a259f589f34fb6a46ee EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

OpenSol

Experience a classic 8080 computer emulator inspired by the Sol-20 Terminal Computer. Interact with original firmware, customize display effects, and enjoy an immersive terminal experience. This independently developed app offers a unique retro computing simulation.

Highlights
  • Intel 8080 interpreter
  • Original OpenSol firmware
  • Sol Command Monitor
  • Customizable display effects (CRT, phosphor)
  • Full-screen immersive mode
  • External keyboard and controller support
  • Virtual cassette tools
Features
Read full description

OpenSol is an independently developed Intel 8080 computer emulator inspired by the Processor Technology Sol-20 Terminal Computer. Explore a 64-by-16 character display, type directly into the original OpenSol firmware, and use the built-in Sol Command Monitor. Choose white, green, amber, or red phosphor; switch between a sharp flat display and period-inspired CRT effects; and use full-screen mode for an immersive terminal experience. OpenSol includes: • A complete independently written Intel 8080 interpreter • Original OpenSol firmware and Sol Command Monitor • iPhone, iPad, and Mac interfaces • Direct typing, touch input, external keyboards, and compatible game controllers • User-selected ENT and raw-binary file import • Private on-device Recent Programs and session restoration • Experimental virtual cassette and USB-audio cassette tools OpenSol includes no SOLOS ROM, vintage applications, download catalog, advertising, analytics, tracking, accounts, or network service. Users provide their own lawfully obtained compatible files. OpenSol is not affiliated with or endorsed by Processor Technology Corporation or any successor rights holder. Historical product names are used only to describe compatibility and historical context.

Screenshots

Lambda4 screens
OpenSol3 screens

Verdict

The call

The clearest difference is update cadence: OpenSol at every 8 days against Lambda's every 5 weeks. OpenSol also leads on ratings volume (4 vs 1) and device support (3 vs 1). On price, rating, ads and in-app purchases there is nothing between them.

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

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Lambda against 5.0 for OpenSol. Both are backed by a comparable volume of ratings — 1 and 4 respectively.

UpkeepUpdate frequency

Lambda ships an update every 5 weeks, OpenSol every 8 days. The most recent releases landed on October 15, 2026 and October 8, 2026 respectively.

Scorecard3 real differences · 7 level
Lambda versus OpenSol: the parameters behind the verdict, then further details
ParameterLambdaOpenSol
PriceFreeFree
Rating5.0 (1 ratings)5.0 (4 ratings)
Positive reviews—100.0% of reviews
Number of ratings14 — better
Update frequencyEvery 5 weeksEvery 8 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhoneiPhone, iPad, Mac — better
Requires iOS17.017.0
Further details — not scored
Size23 MB11 MB
Age rating4+4+
Developer笛 姜Jordan Ruderman

Customer experience

Lambda

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

OpenSol

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Lambda

No in-app purchases

None

OpenSol

No in-app purchases

Questions

Is Lambda free?
Lambda is free to download, with no in-app purchases.
Is OpenSol free?
OpenSol is free to download, with no in-app purchases.
Which has better reviews, Lambda or OpenSol?
Lambda and OpenSol are both rated 5.0 out of 5 on the App Store, from 1 and 4 ratings respectively.
Do Lambda or OpenSol have ads?
Neither Lambda nor OpenSol shows ads.
Which is updated more often, Lambda or OpenSol?
Lambda ships an update every 5 weeks, and OpenSol every 8 days. Most recently, Lambda was updated on October 15, 2026 and OpenSol on October 8, 2026.

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