Deltastring doesn't do a basic tier. It's built for teams running complex, business-critical Zendesk instances, not for kicking the tyres. Configly's entry plan, Solo at £99/mo, is keenly priced for what it is: for a single admin on a smaller, more straightforward instance who just wants to see, snapshot and sanity-check their config, it's likely good value, and we'd happily point that admin at it. It is, though, read-only. It can snapshot, diff and analyse, but it can't apply changes back to Zendesk. The moment you need the tool to actually change your Zendesk, or more than one person needs to touch it, you're on Configly's Multi-Instance (£349) or Agency (£999), and that's the territory Deltastring is built for.

Those two write-capable tiers are the ones that line up with Deltastring Pro (£250) and Enterprise (£750). Deltastring comes in cheaper at both levels, with more shipping today. Much of Configly's enterprise kit (SSO/SAML, multi-user access, custom health-check rules) is still marked "coming soon", and Configly doesn't yet ship an MCP agent interface. At the entry tier Configly Solo is the only option, and only for a single admin who needs read-only insight on one Zendesk instance. Deltastring doesn't compete there, because Deltastring's job starts when you need to change things. At the serious tier Deltastring Pro is £99/mo cheaper than Configly Multi-Instance and adds the MCP agent interface, real multi-user seats, a real-ticket simulator and spreadsheet editing. At the top Deltastring Enterprise is £249/mo cheaper than Agency, with SSO and change approvals live today rather than on a roadmap. Configly keeps the edge on a scored health-check report and, at Agency, white-label branding. Both are on Deltastring's list.

Deltastring takes plain-English requests safely. Deltastring ships an MCP agent interface that lets an AI assistant on your team's desk propose changes to your Zendesk configuration, with the same plan-then-apply gate every other Deltastring change goes through. Sandbox writes apply through the agent after confirmation. Production writes return an approval URL to Deltastring's web app for a different named human to review. Self-review is blocked. Configly doesn't ship an agent interface today. For the argument against the direct-to-Zendesk MCP path, see Why you don't want a direct-to-Zendesk MCP.

Your conventions, followed on every change. Deltastring holds your team's own house rules, how you name things, how you structure triggers, the patterns you've agreed, scoped to an instance and its sandboxes, alongside Deltastring's curated best practice. Bin any default you disagree with. When an assistant makes a change through the MCP it reads your conventions first and works to them, so consistency is enforced as the change is made rather than chased afterwards. This is on the Enterprise tier.

A governed assistant, not a black box on your config. Deltastring deliberately doesn't bolt an AI onto your live configuration to change things on its own judgement. We don't think you should want that. Every capability is exposed through the MCP instead, where an assistant your team already trusts proposes the change, Deltastring plans it, and a named human approves it, all audited and reversible. You get the speed of asking in plain English without handing an opaque model the keys.

Promote between instances safely. Deltastring treats sandbox-to-production as a first-class workflow rather than a copy job. You pick what to ship, Deltastring orders the dependencies, translates IDs across instances, and stops the push if a parent fails so its children don't pile up errors. Cross-instance comparison, sandbox realignment and snapshot restore are dedicated workflow cards.

Built for a team from day one. Multi-user out of the box with team workspaces, a role hierarchy, seat enforcement and cross-organisation access delegation. Enterprise SSO via OIDC is shipped, with discovery, JIT provisioning and domain ownership verification. Change approvals route through submit, review and deploy with a per-user audit trail.

Test with real tickets. Deltastring's simulator replays your triggers and automations against up to fifty real tickets you upload, showing which rules fire, in what order, and what they change. Logic analysis flags redundant conditions, conflicting triggers, unreachable execution paths and shadowed rules. View analysis catches gaps, overlaps and dead views. A tag-flow graph maps every producer, consumer and remover.

Edit in the tools your team already uses. Export configuration to Excel, Google Sheets or Excel Online with brand-styled workbooks, frozen headers and accessible contrast. Change values in the spreadsheet, upload back, and Deltastring shows the plain-English diff before anything reaches Zendesk. Cross-instance provenance is embedded in each workbook, so a production export can't quietly be uploaded into a sandbox.

Broad object coverage and deeper integration. Deltastring covers Talk (IVR, greetings, routes, phone numbers), Chat (departments, triggers, skills, routing) and Help Centre, not just the core Support objects. New connections authorise through one-click Zendesk OAuth (Marketplace-approved), ahead of Zendesk retiring API tokens. Scheduled syncs run hourly, daily or weekly per connection. Nightly drift detection emails the diff at 03:00 UTC, naming who made each change where Zendesk's audit log records it. Deltastring ships a REST API, revocable API keys and HMAC-signed outbound webhooks with retries and a delivery log. Compliance framework packs generate on-demand GDPR, HIPAA and ISO 27001 HTML reports.

A scored 0–100 Health Check report. Configly packages its health analysis as a single shareable report across performance, routing, notifications, data hygiene, SLA compliance and security, with an AI executive summary you can forward to a director. Deltastring runs every underlying detector today, covering broken references, conflicting triggers, view gaps, unreachable rules and more, but doesn't yet roll the result into one numeric score and a single shareable report. What Deltastring's health check does do is act on what it finds: flag an inactive rule and switch it back on, or revert a single drifted object, right from the page. The scored-report packaging is on our roadmap.

A more detailed public trust page. Configly publishes exact crypto primitives, hosting region, OAuth scope explanations in plain English and a subprocessor list. Deltastring's trust section covers the substance (read-only by default, Marketplace-approved OAuth, encryption at rest, config snapshots only, TLS) but doesn't yet name each primitive, region and subprocessor on a dedicated page. We're building that surface out.

For a buyer who'd pick either tool, these surfaces are roughly equivalent. Both ship snapshot history, two-snapshot field-level diff, drift detection on apply, one-click rollback, dependency and reverse-dependency mapping, global search, impact analysis, mandatory change reasons on applied changes, YAML-in-Git workflows, and a public API and webhooks. The details differ in each, but on these surfaces you're choosing on taste rather than capability.