A4Calc vs KubeGrip
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
A4Calc
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A4 Small Format Interchangeable Core Calculator (sister app of A2Calc and A3Calc) ---Programmed by a Locksmith, for Locksmiths--- Automatically calculates the pinning chart for A4 SFIC. Built for 6 or 7 pin systems, however, less can be achieved by using a decimal to erase a chamber. Minimum of a control and master key are required to make a chart. Additional change key available for all devices; 2 change keys available for 16:9 screen devices. Randomize function will generate completely random charts each time it is triggered. "Lock/Unlock" toggle disables/enables all inputs and functions to prevent unwanted/lost changes. Control Finder is an added bonus by reverse engineering a core to determine the control key's bitting. This is perfect when needing to remove multiple cores in a building when the control key has been lost. There are two methods for achieving the control key: 1. using the master, control, and bottom pins, or 2. using only the top/driver pins. Up to 16 different projects can be saved at any one given time. All projects are encrypted and protected with a passcode when stored on your device. All projects can be exported via AirPrint and Email. Compatibility: iPhone / iPod touch on iOS 8.0 or later and iPad on iOS 12.0 or later. Found a bug? Something not working? Have a suggestion? Feel free to contact me via email: farren@phoxlocks.com
KubeGrip
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Take control of your Kubernetes clusters from anywhere with KubeGrip, the native iOS client designed for speed, simplicity, and complete personal control. Whether you're a HomeLab enthusiast running a K3s cluster, a DevOps engineer troubleshooting production services on the go, or a developer experimenting with configurations, KubeGrip puts a powerful, responsive cluster control center right on your iPhone. Core Features: • Cluster Overview & Health Insights: • Get an instant overview of your cluster's health, including node readiness, CPU and memory allocation requests/limits, and storage capacity. • Cluster Issues detector: quickly spot failing pods, crash-looping workloads, and cluster anomalies with one tap. • Pod Diagnostics & Interactive Terminal: • Stream and search real-time container logs with multi-container support. • Launch interactive shell sessions directly from your device (Pod Exec / Terminal). • Inspect historical CPU and memory utilization trends with native iOS Charts. • Examine pod events, conditions, YAML specifications, and associated resources. • Workload Control & Fast Actions: • Rollout restart for Deployments, StatefulSets, and DaemonSets with a safe confirmation step. • Scale replicas up or down instantly. • Trigger immediate runs (Run Now), suspend, or resume CronJobs on demand. • Delete and manage resources safely with built-in guardrails. • Helm & Custom Resources (CRDs): • Browse installed Helm releases and inspect release status, revisions, and details. • Explore Custom Resource Definitions (CRDs) and inspect custom resource objects effortlessly. • Comprehensive Resource Coverage: • Complete visibility across Namespaces, Nodes, Workloads, Networking (Services, Ingress, Endpoints), Storage (PV, PVC, StorageClass), Configs (ConfigMaps, Secrets), and RBAC (Roles, Bindings, ServiceAccounts). • Cordon and uncordon nodes directly to manage workload scheduling. • HomeLab Friendly & Zero Friction: • Built-in interactive Demo Cluster: test drive KubeGrip immediately without any setup. • HomeLab connection guides and network diagnosis tailored for Tailscale, LAN, and K3s setups. • Seamless kubeconfig import via QR code, files, or clipboard, with credentials securely encrypted in Apple Keychain. • Pure Native iOS Experience: • Lightning-fast search and filtering across all resource lists. • Built with SwiftUI: fluid animations, full Dark Mode support, and English & Chinese localization.
Screenshots
Verdict
The clearest difference is price: KubeGrip at Free against A4Calc's $4.99. KubeGrip also leads on update cadence (every 3 weeks vs every 8 months). A4Calc's advantage is iOS requirement (12.0 vs 17.6). 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
KubeGrip is free to download; A4Calc costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
A4Calc ships an update every 8 months, KubeGrip every 3 weeks. The most recent releases landed on September 30, 2026 and October 7, 2026 respectively.
| Parameter | A4Calc | KubeGrip |
|---|---|---|
| Price | $4.99 | Free — better |
| Update frequency | Every 8 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 12.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 2 MB | 25 MB |
| Age rating | 4+ | 4+ |
| Developer | Farren Domenici | 骏 胡 |
In-app purchases
A4Calc
No in-app purchases
KubeGrip
No in-app purchases









