Comparison

R2 Touch vs ETERNAL LITHIUM

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

Head to head
About

R2 Touch

This app serves as a remote control for R2-D2 replica robots equipped with specific receiver boards. It allows users to control various droid functions like dome panels, holoprojectors, sounds, and lighting. Users can upload their own sound files for playback and customize button commands.

Highlights
  • Control dome panels, holoprojectors, sounds, and lighting
  • Upload custom sound files
  • Programmable ASCII string commands
  • WiFi and serial output options
  • Customizable buttons
  • R2-D2 inspired interface
Features
Read full description

This is a remote control app for members of the R2 Builders Club. Apart from looking pretty, and playing sounds (if you upload them to the application), it doesn't do anything unless you are building an R2-D2 replica robot and have MarcDuino receiver boards (as described in www.marcduino.com and on my build log on Astromech.net). If you do, lucky you, it will allow you to control the dome panels, holoprojectors, sounds and dome lighting of your Droid in all sorts of interesting ways. You can see a demo of how it works with my R2 here: http://www.youtube.com/watch?v=AUod3LRQ1DI The app can run all the way down to iOS 8 on an iPhone 4S. The app doesn't include any sounds by default. If you want sounds to play directly from the app or through Bluetooth, you must upload your own sounds files to the App using iTunes. The sound files are typically the exact same you'd use in your remote sound system of the robot such as my MP3Trigger setup (described on www.marcduino.com). Commands, in the form of programmable short ASCII strings, are sent via the internal WiFi iPhone radio to a remote WiFly receiver. Alternately, the app also generates a 9600 baud serial output stream on the earphone audio port. This way you can send serial command to an external XBee transmitter radio for a more reliable link. You'll need a small level adapter board to use the audio serial capability, also on www.curiousmarc.com. Since you can customize most buttons and commands, you could also use this as a generic remote control app to send any short serial string via WiFi (to a WiFly radio fore example) or serial link (through an XBee). And with a spiffy R2-D2 inspired interface to boot!

About

ETERNAL LITHIUM

This platform provides military-grade operational intelligence for lithium power systems. It transforms real-time data into enhanced safety and performance control through AI-powered tactics, cross-domain energy tracking, and cell defense.

Highlights
  • AI-powered State of Charge prediction
  • Cross-domain energy flow tracking
  • Sentinel cell defense and threat alerts
  • Auto-calibration for extreme temperatures
  • 10-second threat mapping
  • Remote countermeasures via Triad Response Network
  • ISO 21782 compliance auditing
Features
Read full description

ETERNAL – Mission-Critical Battery Control Platform Engineer absolute certainty into your power systems. ETERNAL delivers military-grade operational intelligence for lithium infrastructure, transforming real-time data into uncompromising safety and performance control. CORE COMMAND MODULES AI-Powered SOC Tactics Predict State of Charge trajectories with 99.8% accuracy. Simulate runtime under battlefield loads or rapid-charge scenarios with second-by-second adaptive forecasting. Cross-Domain Energy Recon Track multi-source power flow (solar/grid/DC microgrids) via live amperage (A), voltage (V), and kilowatt (kW) telemetry. Identify stealth efficiency losses during critical operations. Sentinel Cell Defense Detect voltage excursions (±0.025V precision) and thermal threats across individual cells. Instant threat-level alerts neutralize cascade risks before system impact. Arctic-to-Desert Readiness Auto-calibrate charging protocols for -40°C to 85°C extremes. Preloaded profiles for submarine batteries, desert solar farms, and alpine microgrids. STRATEGIC CLOUD COMMAND 10-Second Threat Mapping: Upload fault signatures to generate holographic system schematics isolating faults at cell/module/controller layers. Triad Response Network: Manufacturers/technicians coordinate via encrypted live streams, enabling remote countermeasures that reduce field interventions by 80%. ISO 21782 Compliance Engine: Automated forensic auditing with anomaly fingerprints and exportable UN38.3 test reports. DEPLOYED BY • Hyperscale Data Centers • Electric Defense Systems • Orbital Ground Stations • Tier-1 Emergency Networks ETERNAL ADVANTAGE ► Zero-Touch Integration: Auto-recognizes 350+ lithium architectures ► AES-256 + Quantum-Proof Encryption: NATO-grade data tunnels ► Incident Response Hierarchy: Battle-tested roles (operator/commander/engineer) ► Predictive Threat Briefings: AI-generated risk anticipation manifests Activate ETERNAL to secure civilization-critical power ecosystems—where every electron is governed with strategic precision.

Screenshots

R2 Touch4 screens
ETERNAL LITHIUM4 screens

Verdict

The call

The clearest difference is price: ETERNAL LITHIUM at Free against R2 Touch's $5.99. ETERNAL LITHIUM also leads on update cadence (every 3 months vs every 10 months) and rating (5.0 vs 4.8). R2 Touch's advantage is ratings volume (9 vs 1) and iOS requirement (8.0 vs 12.0). On ads, in-app purchases and device support 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

ETERNAL LITHIUM is free to download; R2 Touch costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

ETERNAL LITHIUM holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: R2 Touch has 9 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

R2 Touch ships an update every 10 months, ETERNAL LITHIUM every 3 months. The most recent releases landed on November 1, 2026 and November 5, 2026 respectively.

Scorecard6 real differences · 4 level
R2 Touch versus ETERNAL LITHIUM: the parameters behind the verdict, then further details
ParameterR2 TouchETERNAL LITHIUM
Price$5.99Free — better
Rating4.8 (9 ratings)5.0 (1 ratings) — better
Positive reviews80.0% of reviews—
Number of ratings9 — better1
Update frequencyEvery 10 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPodiPhone, iPod
Requires iOS8.0 — better12.0
Further details — not scored
Size4 MB42 MB
Age rating4+17+
DeveloperNeil HutchisonNanchang Yepai Technology Co., Ltd.

Customer experience

R2 Touch

All ratings9 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews10 reviews
Positive80.0%
Neutral10.0%
Negative10.0%

ETERNAL LITHIUM

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

In-app purchases

None

R2 Touch

No in-app purchases

None

ETERNAL LITHIUM

No in-app purchases

Questions

Is R2 Touch free?
R2 Touch costs $5.99, with no in-app purchases.
Is ETERNAL LITHIUM free?
ETERNAL LITHIUM is free to download, with no in-app purchases.
Which has better reviews, R2 Touch or ETERNAL LITHIUM?
ETERNAL LITHIUM is rated higher. R2 Touch averages 4.8 out of 5 from 9 ratings, while ETERNAL LITHIUM averages 5.0 from 1 ratings.
Do R2 Touch or ETERNAL LITHIUM have ads?
Neither R2 Touch nor ETERNAL LITHIUM shows ads.
Which is updated more often, R2 Touch or ETERNAL LITHIUM?
R2 Touch ships an update every 10 months, and ETERNAL LITHIUM every 3 months. Most recently, R2 Touch was updated on November 1, 2026 and ETERNAL LITHIUM on November 5, 2026.

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