Free IT tools

RAID Calculator

Usable capacity, fault tolerance, IOPS, rebuild time and URE risk for every RAID level — including ZFS RAIDZ.

ZFS / RAIDZ Calculator

Size a ZFS pool properly: parity, ~3.2% slop, padding, multi-vdev pools and the 80% fill rule.

TB ↔ TiB Converter

Convert decimal TB to binary TiB (and GB↔GiB) and see why a 16 TB drive shows as 14.55 TiB.

IOPS ↔ MB/s Converter

Convert IOPS to throughput (MB/s) and GB/day at any block size.

DWPD / TBW Calculator

Convert SSD endurance between drive-writes-per-day and total-bytes-written.

Finder

Storage Solution Finder

Set capacity, IOPS, workload and budget for a workload-matched platform recommendation.

Lifecycle

Storage EOSL Checker

Look up end-of-service-life dates for storage arrays and plan refreshes or third-party maintenance.

Lifecycle

Server & Network EOSL Checker

Sourced end-of-service-life dates for HPE, Dell, Cisco, Lenovo & Juniper servers and switches — extend, refurbish or refresh.

Lifecycle

ESXi & Windows Server Compatibility Checker

Will a Dell, HPE or Lenovo server run ESXi 8, ESXi 9 or Windows Server 2025? 102 models checked per CPU family against Broadcom’s list, vendor matrices and Microsoft’s processor lists.

Operational CO₂e for a server estate on the UK government’s 2026 factors, split into scope 2 and scope 3 — then how long a replacement takes to repay the carbon of building it, using vendor product carbon footprints shown with their real uncertainty. Says when keeping the old kit is greener.

Finder

Server Finder

Cores, memory, drive bays, accelerators, rack height and depth in — the Dell, HPE and Lenovo servers that actually meet it out, checked against each model’s own manufacturer document, ranked by least wasted headroom and honest about which requirement anything fails.

Server Consolidation Calculator

How few current servers replace an ageing estate — sized on cores and memory separately (memory almost always decides it), with N+1, hypervisor overhead, the binding constraint named, and the rack space, power and CO₂e released.

Server Power Consumption Calculator

Pick real Dell, HPE and Lenovo servers — 108 of them — and get provisioned kW from the power supplies their own documents specify, design current per feed, the protective device above it, C13/C19 outlet counts, heat in BTU/hr, and annual electricity cost and CO₂e on the UK government’s 2026 factors.

Rack Space & Power Density Planner

Equipment list in — rack U, kW per rack, circuit and feed count, cooling in BTU/hr, weight, raised-floor point load, mounting depth and UK doorway fit out. Sized on BS 7671 (no bogus 80% derate) with SPECpower-measured draw rather than PSU nameplate.

UPS Sizing & Runtime Calculator

Build your IT load → recommended UPS kVA/kW, load current, heat output and a runtime estimate.

Watts ↔ Amps ↔ VA Calculator

Convert between watts, amps and volt-amps (single- and three-phase) with power factor.

Server Room Cooling Calculator

Turn an IT load into the cooling needed in BTU/hr and tons, with margin and N+1.

Password Strength Checker

Test how strong a password is and how long it would take to crack — 100% in your browser.

Generator

Business Password Generator

Generate up to 100 strong random passwords at once, with CSV export for IT admins.

Generator

Passphrase Generator

Strong, memorable "three random words" passphrases with adjustable length and separators.

Developer

Hash Generator

SHA-256, SHA-1, SHA-384 and SHA-512 hashes of any text, computed locally.

Developer

UUID Generator

Random version-4 UUIDs in bulk (up to 100) — copy one or all.

Assessment

Security Risk Assessment

Free Windows security audit: 17 categories, an A–F score and a remediation roadmap.

Security Header Checker

Grade a site’s HTTP security headers (HSTS, CSP, X-Frame-Options…) against the OWASP set, with fixes.

Comparison

Microsoft 365 Backup Comparison

Compare Veeam, AvePoint, Acronis, Commvault, Dropsuite and Druva side by side — filter by need and estimate cost per user.

Subnet Calculator

IPv4 subnet/CIDR: network, broadcast, host range, mask, wildcard, scope and a subnet splitter.

What Is My IP?

See your public IP, version, scope and reverse DNS — read from your connection, no trackers.

DNS Lookup

Resolve a domain to its IP and DNS records (A, AAAA, CNAME, MX, NS, TXT), live.

VLSM Calculator

Divide a network into right-sized subnets from your required host counts, largest-first.

CIDR Calculator

CIDR ↔ subnet mask ↔ address range ↔ host count, with the bit-level breakdown.

IPv6

IPv6 Subnet Calculator

Compress/expand (RFC 5952), prefix maths, /64 counts and scope for IPv6.

IP Address Converter

Dotted ↔ integer ↔ hex ↔ binary, with public/private scope detection.

Reference

Subnet Cheat Sheet

Every CIDR prefix → mask, wildcard, usable hosts and total addresses, in one table.

Email Security Checker

Scan SPF, DMARC, DKIM, MTA-STS, DNSSEC and MX for a domain — one graded report with a prioritised fix list.

DMARC Checker & Generator

Look up and grade any domain’s DMARC policy, or build a correct v=DMARC1 record with the right reporting.

SPF Checker & Generator

Validate SPF, count DNS lookups against the limit of 10, see the include tree and generate a clean record.

DKIM Checker

Verify the DKIM key at a selector, or auto-probe the common Google, Microsoft 365 and Mailchimp selectors.

DNS Propagation Checker

Check whether an A, MX, TXT, CNAME or NS record has propagated across global resolvers.

WHOIS Lookup

A domain’s registrar, registration/expiry dates, nameservers, status and DNSSEC — via RDAP.

SSL Certificate Checker

A site’s live TLS certificate: expiry, trust chain, issuer, key strength and hostname coverage.

Email Blacklist Checker

Check an IP (or a domain’s mail IP) against Spamhaus, Barracuda and other DNSBLs, with delisting links.

Analyzer

Email Header Analyzer

Paste raw email headers to trace the delivery hops, see SPF/DKIM/DMARC results and spot delays.

AI / GPU Calculator

Size any LLM (Llama, Mixtral, Qwen, DeepSeek) to the exact GPUs, VRAM, server & rack build, power, cooling, capex, finance and a cloud-vs-own break-even.

VMware Alternatives Calculator

Leaving Broadcom? Size your estate onto Proxmox, Nutanix, Azure Local or XCP-ng — hosts, hardware BOM, licence saving vs VCF, finance and a 3-year TCO.

Hardware Maintenance Quote Builder

Build a per-device support schedule, see what each platform keeps and loses when OEM support ends, and download a coverage specification.

TPM Savings Calculator

Cut Dell/HPE/Cisco hardware support 50–70% with third-party maintenance — enter your OEM spend for an indicative saving range and extend support past end-of-life.

IT Finance Calculator

Estimate monthly IT finance payments across hire purchase, leasing and subscription — deposit, balloon and buy-vs-finance, with a formal UK quote.

Cloud vs On-Premise TCO

Compare the 3–5 year total cost of cloud vs on-prem — capex, power, cooling, cloud growth — with a break-even point.

VMware Migration Cost

Compare a Broadcom VMware renewal with Proxmox/HCI — cores billed under the 16/72-core minimums, saving and payback.

IT Downtime Cost

Turn revenue, staff and outage length into the true cost of downtime per hour, per incident and per year.

IT Hardware Refresh & Budget Planner

Plan which hardware to replace in which year across your whole estate, forecast the annual CapEx, flag budget spikes and decide refresh vs extend (TPM) vs finance — with UK capital-allowance guidance.

Backup & DR Sizing Calculator

Size a ransomware-resilient 3-2-1-1-0 backup architecture — production, immutable, offsite and air-gap — from your data, retention and RPO/RTO.

New vs Refurbished Server Calculator

Weigh acquisition saving, multi-year TCO (with the older-gen energy penalty) and carbon for new vs refurbished servers — and get an honest verdict on which wins.

Microsoft & VMware Licensing Calculator

Count the licences you actually need — Windows Server 2025 cores, User/Device CALs & RDS, SQL Server 2025 cores or Server+CAL, and VMware Broadcom per-core subscriptions — with the working shown and the common over-licensing myths avoided.

Veeam License Calculator

Count Veeam Universal License instances for VMs, servers, workstations, NAS and object storage (500 GB per source, rounded down), databases, cloud workloads and Entra ID — which edition fits and how many packs, with Microsoft 365, Salesforce and Kasten counted separately and Veeam’s own wording behind every line.

Windows Server Downgrade Rights Checker

Can your licence run Windows Server 2022, 2019 or 2016 instead? OEM, ROK, Volume Licensing and CSP downgrade and down-edition rights by date, CAL and RDS CAL compatibility, moving licences and used-server COAs — a yes, check or no with the licence clauses behind it.

Windows & SQL Server Cluster Licensing Calculator

License Windows Server 2025 and SQL Server 2025 VMs that move around a VMware or Hyper-V cluster: Standard sized for each host’s peak, Datacenter, per-VM with Software Assurance, SQL fail-over rights, Server + CAL and Azure Arc pay-as-you-go — only the routes Microsoft’s terms allow, with the working shown.

Azure Local Pricing Calculator

What an Azure Local (Azure Stack HCI) cluster costs per physical core: L1 and L2 host fees from Microsoft’s own £ and $ meters, the Windows Server subscription as the add-on it is, and whether Azure Hybrid Benefit, an OEM licence or your own Datacenter licences fit — with the working shown.

Windows 10 End of Life Calculator

Support ended October 2025. Split your fleet into upgrade-free vs needs-replacing, compare Microsoft’s escalating ESU ($61 doubling, cumulative) against a new-vs-refurbished Windows 11 refresh, and get the break-even year plus your Cyber Essentials / PCI compliance risk.

Windows Server 2016/2019 EOL Calculator

Server 2016 support ends 12 Jan 2027. Weigh an in-place upgrade to Server 2025 against escalating ESU and a hardware refresh — verified flat ESU model, 16-core minimums, Azure free-ESU, break-even year and compliance risk, with no fake hardware gate.

HCI Node Sizing Calculator

Vendor-neutral hyperconverged sizing: enter one workload and get the node count for VMware vSAN ESA, Nutanix and Azure Local side by side — verified raw→usable maths (adaptive RAID, RF2/RF3, mirror/nested resiliency, repair reserves) with N+1. No login, no single-vendor lock-in.

PoE & Switch-Sizing Planner

Turn a fleet of access points, cameras and phones into a switch spec — PoE budget sized on PSE watts (not device draw), the right 802.3af/at/bt port type, headroom, switch count and uplinks. Verified IEEE class wattages.

SQL Server 2016/2017 EOL Calculator

SQL 2016 support ended 14 July 2026. Cost the four paths — flat cumulative ESU (~100% of licence/year), in-place upgrade to SQL 2025, or a refresh onto fewer faster cores that cuts the licence bill itself. Verified rules; SQL 2017's no-ESU cliff included.

Exchange SE vs Exchange Online Calculator

Exchange 2016/2019 are past end of life and ESU dies Oct 2026. Compare 3-year costs of Exchange Server SE (2016 estates need a new server) vs Exchange Online vs hybrid — verified upgrade paths, SE licensing mechanics and the CU2 deadline.

Microsoft 365 Licensing Calculator

Price a real M365 seat mix in GBP or USD — track the 300-seat Business family cap before you hit it, suppress add-ons your plan already includes instead of paying twice, route Copilot vs the cheaper Copilot Business SKU, and test the E3 → E5 break-even. Microsoft public list prices, each one cited and dated.

Encoding

Base64 Encode & Decode

Convert text to Base64 and back, with URL-safe output. UTF-8 correct, 100% client-side.

Format

JSON Formatter & Validator

Beautify, minify, validate and key-sort JSON, with the line and column of any error.

Time

Unix Timestamp Converter

Epoch ↔ human date (UTC/ISO) in seconds or milliseconds, with the live current Unix time.

Scheduling

Cron Expression Generator

Build a cron schedule, read it in plain English and preview the next run times in UTC.

Encoding

URL Encoder & Decoder

Percent-encode/decode and break a URL into its parts and decoded query parameters.

Text

Regex Tester

Test regular expressions live with flags, highlighted matches and capture groups.

Security

JWT Decoder

Decode a JWT’s header and payload with human-readable dates and an expiry check.

Finder

Business Laptop Finder

Tell us the use case — get a vendor-neutral ranked shortlist across 87 business laptops (ThinkPad, EliteBook, Dell Pro, MacBook, Surface, ASUS) with a plain-English why and side-by-side compare.

Server Configurator

Build a server spec across HPE, Dell and Lenovo — new or refurbished — then request a quote.

HPE MSA Configurator

Build an HPE MSA array: controllers, drives, RAID and live raw/usable capacity.

Dell PowerVault Configurator

Configure a Dell PowerVault ME5 block SAN with live capacity.

Tape & Backup Configurator

Size HPE StoreEver LTO tape drives and libraries for air-gapped, low-cost archive.

Compare

Product Comparison

Compare products side by side, spec for spec.